I've seen it in the field from this manufacturer:
http://www.kristechwire.com/use-2-solar-wire.php
Original Message
Subject: Re: [RE-wrenches] USE-2 in white?
From: EcoSolar - Eric Andrews
To: 'RE-wrenches'
Date: 2010/8/2 12:32
YES. We get ours from PLATT Electric. Most el
230.79(C):
230.79 Rating of Service Disconnecting Means.
The service disconnecting means shall have a rating not less than the
calculated load to be carried, determined in accordance with Part III,
IV, or V of Article 220, as applicable. In no case shall the rating be
lower than specified in 2
In John's white paper on wiring Enphases:
http://www.nmsu.edu/~tdi/Photovoltaics/Codes-Stds/WIRING%20ENPHASE%20MICROINVERTERS-11.pdf
he recommends covering the module first anyway so the load-break
disconnect isn't really an issue. Since you're at the module anyway to
disconnect that module fro
On my own system I have a DC suppressor from
http://www.surgesuppression.com/
It's UL listed with a 25-year warranty. Not as cheap as a Delta (or
Citel as far as I know) though, but I felt a lot more confident with
this given our crazy lightning storms in FL.
DKC
Original Message --
And more specifically:
690.34 Access to Boxes.
Junction, pull, and outlet boxes located behind modules or panels shall
be so installed that the wiring contained in them can be rendered
accessible directly or by displacement of a module(s) or panel(s)
secured by removable fasteners and connected
I just remembered that I've seen Deltas pre-installed (by the factory)
within Satcons- at least the 50s, and I think they're in the 250s as
well. I guess they'd look a bit weird sticking out of the cabinet!
Dave Palumbo wrote:
Bill,
I checked with Delta and they say the LA’s are designed to b
I'd worry about putting such a high current in anyway- Enphase's max
input is 10A (max Isc 12A) while the Evergreen Imp is 11.69 for their 215W.
Original Message
Subject: Re: [RE-wrenches] GEC for Enphase inverters
From: Nick Soleil
To: RE-wrenches
Date: 2010/9/16 10:58
Tha
I believe this is saying that after the initial LID (Light Induced
Degradation), it will be rated at no less than 97% of STC. AFAIK, LID is
easily a percent or two on most modules. These modules will have been
tested to produce at least their rated output when they leave the
factory, before the
How about hardware cloth along the back of the array beneath the rails?
I think that's been suggested on this list before.
Original Message
Subject: [RE-wrenches] Ground Mount Screening
From: Drake
To: RE-wrenches
Date: 2010/10/21 12:34
Hello Wrenches,
We are installing a
Fronius IG Plus on the spec sheet also specs "Max. continuous utility
back feed current" as 0A.
Original Message
Subject: Re: [RE-wrenches] Head Spinning..(Con) fused.
From: William Miller
To: RE-wrenches
Date: 2010/11/14 12:54
Darryl:
If Aurora can not verify that their i
I think that if you have the 705.10 directory showing the disconnect
locations (a directory at each location), you'd be OK per NEC. I think
this question is likely one to ask your utility- the language may be in
your interconnection agreement and you likely already know how flexible
utilities a
At a Xantrex training once upon a time, they explained that the three
foot minimum height was to keep the unit out of reach of a typical lawn
sprinkler. I don't know of an NEC reference for any minimum height required.
Peter Parrish wrote:
I spent some time putting together information on the
I believe it's just:
Fusing on the +/-
disconnects break both + and -
Need your modules to use PV wire
labeling per 690.35(F)
Square D discos are UL'd for ungrounded systems- and I just noticed that
there's a June 2010 revision of the Square D disconnect guide. A bit of
clarification since the
690.35 (D) The photovoltaic source conductors shall consist of the
following:
(1) Nonmetallic jacketed multiconductor cables
(2) Conductors installed in raceways, or
(3) Conductors listed and identified as Photovoltaic (PV) Wire
installed as exposed, single conductors.
***
As soon as
Hi all,
My awesome coworker James converted the ASHRAE temperature data in the
back of the Solar ABCs expedited permitting guide from a spreadsheet
into a map format. Thought I'd run it by the list to see if there are
any changes you'd recommend (probably best if you reply to me off-list).
If
The grant was just passed for 2011 as well:
http://www.seia.org/cs/news_detail?pressrelease.id=1181
The ITC continues through 2016/12/31, and nothing's changed for solar
hot water.
http://www.dsireusa.org/incentives/incentive.cfm?Incentive_Code=US37F&re=1&ee=1
Original Message ---
Short answer: no, this product's reactive power generation will not
affect you in the real world.
Long answer:
I don't see how their 6kVA system could outperform your 10kW system
unless you're installing your system in the shade. This device seems to
be quite limited- max VOC 42VDC, max input
Standard residential utility meters couldn't care less about power
factor and will ignore reactive power. Additional utility bill savings
by using these reactive-capable microinverters is $0.
Dan brought up a good point that adding too much capacitance also hurts
power factor- so even if a uti
Hi all-
Does anyone have a copy of the 2009 International Residential Code? I
only have the 2006. Please reply off-list. Thanks!
Dave
___
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options & settings:
http
John,
The 2% "ambient temperature" from ASHRAE is the appropriate starting
point to use for these calculations. For some additional background I'll
quote Bill:
**
ASHRAE bases its ‘warm‐season temperature conditions’ for each city on
annual percentiles of 0.4%, 1.0% and 2.0%. As an example,
where they plan to run
conduit on a roof (nor can I control it) and I start "what-if'ing"
whether my design numbers will be conservative enough to prevent a
system failure or a fire.
Thanks and regards,
John Wadley, PE
NABCEP Certified Solar PV Installer (TM)
Wadley Engineering
That's a nice built-in alarm feature that locking connectors just can't
provide...
Nick Soleil wrote:
Hi wrenches:
Have you noticed that roofing companies have recently been trying to
sell solar? One company thought of something that I had never
considered. Listen to this neat story.
I was serv
310.4(B) Conductor Characteristics. The paralleled conductors in each
phase, polarity, neutral, grounded circuit conductor, or equipment
grounding conductor shall comply with all of the following:
(1) Be the same length
(2) Have the same conductor material
(3) Be the same size in cir
We had to recently deal with this. It's complicated.
As I understand it:
The WTO list of ~60 countries counts as "Buy American" ONLY IF a project
is more than $7,804,000 (I believe this amount relates to the check
being written for your Sanyo project, as opposed to the total funding
amount VT
338.10(B)(4)(b) says to support in accordance with 334.30:
334.30 Securing and Supporting.
Nonmetallic-sheathed cable shall be supported and secured by staples,
cable ties, straps, hangers, or similar fittings designed and installed
so as not to damage the cable, at intervals not exceeding 1.4
If you have a muni then it's possible, but I'd guess that with most
investor-owned utilities they'd just laugh in your face. There are a few
utilites out there that have done this- I think that Portland, OR and
Seattle have this and we're working on it here in Orlando too.
These links should h
Nick, you can still use Visio/AutoCAD on the Mac if you install
Parallels or VMWare, which allow you to run Windows programs. Either of
those would run you about $80, which is cheaper than OmniGraffle. Each
of these three software packages have trial versions so you can check
them out before yo
alters
r...@solarray.com <mailto:r...@solarray.com>
Solar Engineer
On Apr 9, 2011, at 10:40 AM, Dave Click wrote:
> Nick, you can still use Visio/AutoCAD on the Mac if you install
Parallels or VMWare, which allow you to run Windows programs. Either of
those would run you about $80, whic
All, just noticed that this email hadn't gone through to the wrench
list. Good follow-up to our March discussion (subject line: Value of PV
system to a home).
Original Message
Subject: Berkeley Lab Study Finds that Solar Photovoltaic Systems Boost
the Sales Price of Californ
Dan, I think we're only looking at an error of 20 minutes per (8760 hrs
x 60 min / hr) = 0.00381%, well within the frequency drift allowed under
UL 1741. So as you point out, it would only be the shorter excursions
away from 60.0Hz that would be the issue. This shift isn't the easiest
thing in
Yes. It looks like some efficiency improvements only qualify on a main
home, but it's different for solar.
http://www.irs.gov/pub/irs-pdf/f5695.pdf
Page 4: Qualified solar electric property costs. Qualified solar
electric property costs are costs for property that uses solar energy to
generate
Per 690.41 you probably wouldn't need to ground it for a system like
this, but I like the idea of dropping a ground rod down into the water.
Then curve the end and find a big worm, of course.
**
690.41 System Grounding. For a photovoltaic power source, one conductor
of a 2-wire system with a p
I just asked a guy I know in utility metering, and he confirms that
there's no basis for the utility's concern. Their claim that backfeeding
is a safety hazard could be an attempt to dissuade some non-PV folks
from flipping their meters to steal power. Or that could be their
justification to ch
As I read the rule, that 100' in the trench allows you to go 10' above
grade on each side while just worrying about the ampacity in the 100'
section (be sure to check that your terminals are OK). For 200' in the
trench, you're still looking at 10' above grade on each side. The rule
doesn't say
That's right, Drake. The long wire acts as a heat sink for that short
section.
On 2011/8/17 17:58, Drake wrote:
I think this answers a question I was pondering. If a conduit is run on
standoffs over a roof, the temperature is cooler than on the roof, so
the derating of the wire's ampacity is l
The inverter should be current-limited on its output. The other Enphases
have a higher output power than rated (199 @ 190, 219 @ 210, if memory
serves from earlier list posts), so this may have a similar window.
215Wac max inverter output / 240V = 0.896
0.896 x 17 = 15.23A
15.23A x 1.25 < 20A s
A letter from your insurance company may do the trick here. They
probably wouldn't be too happy about the homeowner, curious child, OR
inspector using your ladder even if you are on site watching it.
On 2011/9/1 7:45, Jason Szumlanski wrote:
Is anyone being forced to leave ladders up and secur
To add to Ray's comments, it's a good idea to minimize the area of your
source circuits' wiring loops as well, to minimize voltage jumps from
nearby strikes (of course, direct strikes blast a hole in the roof, so
no suppression can really help you there). I have a DC arrestor from
surgesuppress
UL 1703 is a 30 psf positive (downward) or negative (upward) load, or a
design load designated by the manufacturer. I've never seen a module
advertising a 30psf loading requirement--everything I've seen is at
least 50psf--which I take to mean that this "designated" design load is
usually spec'd
CTRIC*
**
**
Original Message
Subject: Re: [RE-wrenches] Module Load Rating
From: Dave Click mailto:davecl...@fsec.ucf.edu>>
Date: Fri, October 07, 2011 9:31 am
To: RE-wrenches mailto:re-wrenches@lists.re-wrenches.org>>
UL 1703 is a 30 psf positive (down
The Square D switches would work (as would others, I'm sure, but I knew
how to find this file). And you don't need to break each pole twice:
http://static.schneider-electric.us/docs/Electrical%20Distribution/Safety%20Switches/Solar%20Disconnect%20Switches/3110DB0401.pdf
Note wiring diagrams 1A,
At an SMA training last year they recommended the following temperature
adders:
Open field: +22°C
Rooftop, lots of ventilation: +28°C
Rooftop, some ventilation: +29°C
Rooftop, little ventilation: +32°C
Rooftop BIPV, no ventilation: +43°C
Façade, some ventilation: +35°C
Façade, little ventilation
alculation. Should I
suggest that my students just use the inverter manufacturers' online
tools, and forget about trying to run this voltage calc themselves?
Thanks,
Ray
On 12/1/2011 6:30 AM, Dave Click wrote:
At an SMA training last year they recommended the following
temperature adders:
Open f
Marco, the easiest solution may be to just replace it with a 4-pole
disconnecting combiner from another manufacturer. SolarBOS, for example,
has one available in 4X (fiberglass or SS).
On 2011/12/7 12:41, Marco Mangelsdorf wrote:
Anyone ever come across the SMA combi switch in a stainless encl
Burndy's changed its part# from the CL50-DB-T to the CL50-1TN. Still
direct-burial, still tin-plated, still "commonly used for solar panel
grounding." The tech support guy I spoke with last December said that
their lugs are now all direct-burial, so they decided that there wasn't
a point in kee
I'm not sure what my favorite part is:
1. the note at the bottom of the page of "NOTE: This unit is NOT UL
listed so it can only be represented as an experimental device. It does
shut down and disconnect from the grid if it senses that the grid has
gone down (power outage). This protects utilit
From DSIRE:
http://www.dsireusa.org/incentives/incentive.cfm?Incentive_Code=US37F&re=1&ee=1
"The home served by the system does not have to be the taxpayer’s
principal residence."
And from the IRS:
http://www.irs.gov/pub/irs-pdf/f5695.pdf
"Your main home is generally the home where you live most
minal.
DKC
Original Message
Subject: Re: [RE-wrenches] What is a "direct-current system"?
From: Peter Parrish
To: 'Dave Click'
Date: 2009/6/19 14:12
No, the inspector is saying that 690.47(B) applies, and as a consequence,
250.166 applies. He didn'
Weird! I was looking through the list archive for info on lightning
arrestors earlier this afternoon and coincidentally, this email may
help, from Aaron Wellendorf on 2006/4/12:
http://lists.re-wrenches.org/htdig.cgi/re-wrenches-re-wrenches.org/2006/019214.html
"I have used a different brand of
Yes they do:
http://www.solyndra.com/Products/More-Electricity
Original Message
Subject: Re: [RE-wrenches] Tube solar collectors
From: Joel Davidson
To: RE-wrenches
Date: 2009/7/21 09:46
Hello Kelly,
Thanks for the feedback. Does anyone know if the Solyndra CIGS modules
c
Peter-
Appendix J of "PV and the NEC" covers this, too; as Kirpal said, you'll
need to know the series fuse rating for the module first, though.
http://www.nmsu.edu/~tdi/pdf-resources/pdf%20version%20divided%20PV:NEC/APPENDIX%20J.pdf
Original Message
Subject: Re: [RE-wrenche
something like this?
http://www.hialeahmeter.com/eawame.html
Original Message
Subject: [RE-wrenches] Watt-hour meter
From: Eric Andrews
To: RE-wrenches@lists.re-wrenches.org
Date: 2009/7/28 13:16
I’m looking for a Watt-hour meter that is hard-wired (not a Kill-O-Watt
plugin)
SolarWorld modules are 5400pa-rated too, but that's "only" 113 psf,
right? These might be OK if you do a full clamp along the long sides of
the modules (for SolarWorld at least, the 5400pa rating was determined
per IEC 61215, while supporting only the short sides), but it's
obviously not withou
It seems to me that allowing an expensive array to be quickly and easily
removed from a roof is a Very Bad Thing- I'd guess that the customer's
insurance company would have an issue with this too. Will they also
require that heat pumps have wheels and flexible pipes, so that they can
be moved b
2% loss is significant, but I think that Darryl was saying that the
resistance for stranded wire was 2% higher than solid. So if you had a
3% voltage drop in your system with stranded wire, you could rewire the
system with solid wire and have a voltage drop of (3% x 0.98) 2.94% at
peak producti
PV
arrays to be visible from the street.
- And now, making improvements on a system that is working flawlessly
for almost 100,000 hours does not make cost vs. benefits sense.
Joel Davidson
- Original Message - From: "Dave Click"
To: "RE-wrenches"
Sent: Wednesday,
You are receiving Wrench list digests. If you are responding to one of the
messages in the digest, be sure to replace the subject line with the correct
one for the individual message. Thanks.
Here's a cable that may use B.310.1, which is probably overkill for most
of our work:
http://www.amerc
The only system I've done with this feature, we used 2 Seas (now Iron
Ridge, it appears) racking. I guess if you can limit those racks to
being only two modules high, the weight would still be manageable. Still
not something that one person can easily adjust, though.
Example:
http://www.ironri
All,
Couldn't find this anywhere in the archives; sorry if it's a repeat. I
just went out to inspect a ground-mount system that had 3 source
circuits feeding a metal DC combiner/disconnect. Wiring was free air
until it got near the disconnect, then the positive wires entered an
open 3' sectio
es.
-Kelly
Kelly Keilwitz, P.E.
Whidbey Sun & Wind, LLC
Renewable Energy Systems
NABCEP Certified PV Installer
987 Wanamaker Rd,
Coupeville, WA 98239
PH & FAX 360-678-7131
sunw...@whidbeysunwind.com
On 8/19/09 2:41 PM, "Dave Click" wrote:
For the grounding electrode wiring, it
ird-Sun.com
Clean Energy - Expertly Installed
- "Dave Click" wrote:
> Thanks all.
>
> It was my understanding that we should still be running the
conductors
> of the same circuit through the same raceway, even if it is the
DC input
> into the
I'd had this question a while ago, and thought I'd send a few links I
found last year in case they're helpful for anyone.
http://www.renewableenergyworld.com/rea/news/article/2008/03/pumped-storage-to-back-up-renewable-energy-51745
from that page:
1994 IEEE Study on reservoir size requirements (
I've heard of them and they are new. I don't think they're making them
in Florida yet but they claim to be US-made. I think that on the
previous edition of their website they were planning an 800W crystalline
module(!), now they seem to have scaled back to "only" a 600W sometime
next year.
Th
Carl, it looks like you're already Code-noncompliant thanks to the 100A
garage panel having 100A utility, 20A PV, and 20A wind breakers
supplying it. Adding an additional 20A of PV of course doesn't help
things. I'd replace the 100A panel with a 150A+ (so probably a 200A),
keeping the 100A main
Hi all,
I'm working on a project for a state park, where they're looking to add
some PV-powered fans to a outdoor bus stop. The customer is hoping to
have the fans spin more quickly as irradiance increases, and they want a
master cutoff switch. I'm initially planning to use 2 10W modules
(ser
The original code citation here was directed toward large rooftop unit
(RTU) air conditioners and other large equipment that can not be
disconnected without extensive cost and disruption to the building
occupants during re-roofing. Hopefully this helps someone in case they
have this imposed as
This may help, from a SEIA webinar in September. To answer your
question: "It depends." (sorry!) See pages 13-15.
http://www.seia.org/galleries/pdf/SEIA%20Tax%20Basis%20Webinar%209%2024%2009%20%5BCompatibility%20Mode%5D.pdf
Original Message
Subject: Re: [RE-wrenches] 2009 Fede
http://www.rules.house.gov/111/AmndmentsSubmitted/hr2454/cardoza173_hr2454_111.pdf
Back in June, I found this amendment to the Waxman-Markey Cap and Trade
bill- limiting solar permit costs for residential at $500 and
noncommercial at 1% of the project cost, up to $10k. Noncompliance with
permi
Peter,
(1) it appears that per the WEEB installation manual:
http://www.we-llc.com/Datasheets/104-0404-08-008.pdf
(page 8) you need to have one WEEB per module rather than one for every
other module as you suggest.
(2) 690.43 Equipment Grounding.
Exposed non–current-carrying metal parts of
B clips bonding modules C and D to
rails #1 and #2, etc. - Peter
-Original Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Dave Click
Sent: Tuesday, November 17, 2009 12:14 PM
To: RE-wrenches
Subject: Re: [RE-wrenches]
Just a note here- rather than using the record lows, you can go back to
the future and use the ASHRAE minimum expected temperatures as the 2011
NEC will allow explicitly. In the '08, it says to use the "lowest
expected ambient temperature," for which the ASHRAE temperatures are
more appropriate
:re-wrenches-boun...@lists.re-wrenches.org>] On Behalf Of
Dave Click
Sent: Tuesday, November 17, 2009 1:09 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Bonding Rails
Yes, that's correct. In my answer I was just rephrasing it to say you'd
need twice as many WEEBs a
2500U Inverter
From: robert ellison
To: RE-wrenches
Date: 2009/11/18 11:01
My eyes must be bad, i just looked at the entire list 3 times and New
York state is not on it anywhere.
I have see 48 below and just wanted to see what the averages ctually were.
Bob
On Wed, Nov 18, 2009 at 7:30 AM,
V Installer
Renewable Energy Systems
www.oregonsolarworks.com <http://www.oregonsolarworks.com/>
541-218-0201 m
541-592-3958 o
On Wed, Nov 18, 2009 at 8:14 AM, Dave Click <mailto:davecl...@fsec.ucf.edu>> wrote:
Good catch Bob, there seems to be a page missing from that table.
Wrenches-
How are folks wiring the Soladeck boxes? It seems that the intent is to
use cord grips in the south end of the box, but I just saw another
installation where the wires just came directly in through the space at
the south end. Seems like the foam is included to keep bugs out rather
t
Scott M. Knapp, Ph.D.
Solartek LLC
Phone: 407-462-1182
Email: sc...@solartek.com
Web: www.solartek.com
On Tue, Nov 24, 2009 at 3:12 PM, Dave Click wrote:
Wrenches-
How are folks wiring the Soladeck boxes? It seems that the intent is
to use
cord grips in the south end of the box, but I just s
> Speaking of IBEW, how
> about the installation done in Dorchester, Ma., do you mount your arrays
> vertically?
That (relatively small--5.4kW) array was installed vertically to improve
its visibility from I-93. It was understood that vertical PV facing
somewhat SE wouldn't have been as efficie
ment
that might find use here.
I am aware of others on this List that have a web "Rogue's Gallery" of how
not to do it. Is there any place where this is a unified collection?
Respectfully,
Bill Loesch
Solar 1 - Saint Louis Solar
- Original Message -
From: "Dave Clic
I believe that in a Code Corner back in the '05 era, John Wiles had said
that MC cable was OK to use, then in a later Code Corner he says that it
isn't; I thought it was because part of the reason for a metal raceway
is physical protection, and EMT/FMC would be sturdier than MC. But then
I look
Something that may help with the inspector would be to alternate
trusses. If your array spanned ten trusses, which I'll call A-J, and you
have three rows of six rails:
Rail #1, 3, 5: attach to A, C, E, G, I, J
Rail #2, 4, 6: attach to A, B, D, F, H, J
It's not helping his concern on the end tr
In Photon's side-by-side module test a few years ago, I remember that
one of the worst-performing modules (in kWh/kW) had marketing materials
that targeted the off-grid market. The author suggested that by
targeting off-grid, they were able to obscure their low production-
perhaps another reaso
0.9 x latitude seems to be a good rule of thumb for direct grid-tie systems.
Original Message
Subject: Re: Malabar Cove Solar Array
From: ScottT
To: Dave Click
Date: 2010/1/2 12:39
Hello Wrenches,
My Solar Pathfinder Assistant (SPA) claims that the optimum tilt angle
for
There's no problem with installing the panel and 690.64(B) is the
appropriate section to look at.
"690.64(B)(2) Bus or Conductor Rating. The sum of the ampere ratings of
overcurrent devices in circuits supplying power to a busbar or conductor
shall not exceed 120 percent of the rating of the b
Sometimes utilities will set a max too- here in Florida the
investor-owned utilities have a rule that you take (d...@stc) x 0.85 to
get the "AC equivalent" size of the array. That size then can't exceed
90% of the service rating. Not sure if this is an issue in other states.
Scott McCalmont wr
Late reply, but if anyone ever needs the code reference for William's
method:
404.6 Position and Connection of Switches.
(C) Connection of Switches. Single-throw knife switches and switches
with butt contacts shall be connected such that their blades are
de-energized when the switch is in the o
Is the answer here (at least the one that NABCEP intends) just that the
VMP of a "12V module" is higher than the voltage of a 12V battery? With
the higher voltage it will charge the battery with its corresponding
current based on the I-V curve. The objective reads "Explain why PV
modules make e
Looks like your question is answered but something else to look out for-
this is pretty straight-forward for batteryless systems but for
battery-backup and a line-side tie, you're adding a big load to the
service conductors for battery charging and pass-through current to
critical loads. If you
I'd agree that 690.13/14 don't require a DC disconnect out there
(notably 690.14(C)(5)). I'd still think it's a good idea for maintenance
and safety so that you don't need to go 300 feet to turn off power and
worry about lockout/tagout.
You would have to wire the two outer poles in series to u
One could interpret that if you have 6 or more inverter breakers getting
combined in a panel, you'd want one main breaker so that you wouldn't
have to turn off all ten individually to disconnect the system.
Something else to ask the AHJ.
Peter Parrish wrote:
When we use a sub-panel to combine
Jeff- The Sunny Boys can be reprogrammed into "off grid" mode so they
can work between 56-64 Hz, but I believe you need both a service cable
and a call to SMA tech support to make that happen. They then note in
their system that that inverter's been adjusted to no longer meet UL 1741.
Jeff Yag
It seems to be -0.5%/degC:
http://rredc.nrel.gov/solar/calculators/PVWATTS/moreabout.html
Original Message
Subject: [RE-wrenches] PVWatts Module Temperature Coefficient (was
Enphase derate)
From: Joel Davidson
To: RE-wrenches
Date: 2010/4/18 12:23
Wrenches,
PVWatts does
Something you can do is guarantee a kWh amount given a certain amount of
irradiance. Offer X annual kWh given 2000 sun-hours, perhaps. If you're
in a snowy area, just make sure the irradiance meter keeps snow on it as
long as the modules would.
Of course you wouldn't just take 0.8 into PVWatts
Good call Ray to incorporate out-of-spec grid in areas where that's an
issue (and probably a good idea to include just in case!).
If you need justification on future projects as to why you can't just
guarantee a flat #:
http://rredc.nrel.gov/solar/calculators/PVWATTS/version1/interp.html
"For
I've got my SMA SB5 on a revenue grade meter and it's actually
under-reported slightly since I started comparing it last August. SMA's
counter has increased by 5649 kWh while the revenue meter has increased
5666 kWh- only 0.3% off. If I remember correctly from their training
session they said t
Quick poll- how many inspectors/utilities out there require the "live on
both sides" label for AC Disconnects, even after you explain to them
this only applies to DC disconnects? Even though it's inaccurate, I feel
that it at least gives unqualified personnel pause before they open up a
switch
I hope for your sake that you're kidding, because your residential
customers may eventually find out that the power-save devices don't
deliver the promised savings and will ask you why it was a $400 option.
I'm guessing that the Oceanlink "Energy Solution" is even less effective
than the power
Jason, I don't believe that you're working with correct information and
I'm not sure who you spoke with here at FSEC. Please contact me offlist
so we can discuss this further.
Also, we'd be pretty excited to learn that you were installing 200
systems in the state. Carry on!
Original
THWN-2 smaller than #8 is hard to find but I hear
http://www.encorewire.com/site_flash/index.html makes it and that
Graybar sells it. When I asked Southwire about it about two years ago, I
got a collective "huh?"
Original Message
Subject: Re: [RE-wrenches] #10 THWN-2
From: Da
The obvious disclaimers of course apply to this message...
The only time a customer would find out that they were "disallowed" is
if they are audited, right?
Anyway, from the 5695 form sent out earlier, emphasis added:
"Qualified solar electric property costs. Qualified solar electric
propert
Allan- SMA tech support confirmed with me yesterday that the 3/4/5 kW TL
units are compatible with the SMA frequency shifting.
On 2013/8/2 16:34, Allan Sindelar wrote:
Will the Sunny Island mate up with these Sunny Boys that have the
limited backup capability during an outage, as they will with
1 - 100 of 215 matches
Mail list logo
